With a Animation is there a way like in Unity with an AnimationCurve to get the value at a specific time of the animation?
For example in unity if I want to make a curve in the editor and then use it in the script as a easing control I can do something like animationCurve.Evaluate(time) and get the value for that specific time. I know the systems are not the exact same but couldn’t we or do we support something like this already with Animations?
Internally we have the animatable._interpolate which is doing that but we do not (yet) expose a way to get the value.
I could do that if you want…(the price for it: creates an issue for me to track the need ;))
Babylon Scene Manager has BABYLON.Utilities.SampleAnimation functions… One line of code to handle 
The details of my Animation evaluation functions
/** Gets the float "result" as the sampled key frame value for the specfied animation track. */
public static SampleAnimationFloat(animation:BABYLON.Animation, time: number):number {
let result:number = 0;
if (animation != null && animation.dataType === BABYLON.Animation.ANIMATIONTYPE_FLOAT) {
const keys:BABYLON.IAnimationKey[] = animation.getKeys();
if (time < keys[0].frame) {
time = keys[0].frame;
} else if (time > keys[keys.length - 1].frame) {
time = keys[keys.length - 1].frame;
}
// ..
if ((<any>animation)._state == null) (<any>animation)._state = { key: 0, repeatCount: 0, loopMode: BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE, workValue: BABYLON.Matrix.Zero() };
result = BABYLON.Utilities.InterpolateAnimation<number>(animation, time, (<any>animation)._state);
}
return result;
}
/** Set the passed vector2 "result" as the sampled key frame value for the specfied animation track. */
public static SampleAnimationVector2(animation:BABYLON.Animation, time: number):BABYLON.Vector2 {
let result:BABYLON.Vector2 = null;
if (animation != null && animation.dataType === BABYLON.Animation.ANIMATIONTYPE_VECTOR2) {
const keys:BABYLON.IAnimationKey[] = animation.getKeys();
if (time < keys[0].frame) {
time = keys[0].frame;
} else if (time > keys[keys.length - 1].frame) {
time = keys[keys.length - 1].frame;
}
if ((<any>animation)._state == null) (<any>animation)._state = { key: 0, repeatCount: 0, loopMode: BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE, workValue: BABYLON.Matrix.Zero() };
result = BABYLON.Utilities.InterpolateAnimation<BABYLON.Vector2>(animation, time, (<any>animation)._state);
}
return result;
}
/** Set the passed vector3 "result" as the sampled key frame value for the specfied animation track. */
public static SampleAnimationVector3(animation:BABYLON.Animation, time: number):BABYLON.Vector3 {
let result:BABYLON.Vector3 = null;
if (animation != null && animation.dataType === BABYLON.Animation.ANIMATIONTYPE_VECTOR3) {
const keys:BABYLON.IAnimationKey[] = animation.getKeys();
if (time < keys[0].frame) {
time = keys[0].frame;
} else if (time > keys[keys.length - 1].frame) {
time = keys[keys.length - 1].frame;
}
if ((<any>animation)._state == null) (<any>animation)._state = { key: 0, repeatCount: 0, loopMode: BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE, workValue: BABYLON.Matrix.Zero() };
result = BABYLON.Utilities.InterpolateAnimation<BABYLON.Vector3>(animation, time, (<any>animation)._state);
}
return result;
}
/** Set the passed quaternion "result" as the sampled key frame value for the specfied animation track. */
public static SampleAnimationQuaternion(animation:BABYLON.Animation, time: number):BABYLON.Quaternion {
let result:BABYLON.Quaternion = null;
if (animation != null && animation.dataType === BABYLON.Animation.ANIMATIONTYPE_QUATERNION) {
const keys:BABYLON.IAnimationKey[] = animation.getKeys();
if (time < keys[0].frame) {
time = keys[0].frame;
} else if (time > keys[keys.length - 1].frame) {
time = keys[keys.length - 1].frame;
}
if ((<any>animation)._state == null) (<any>animation)._state = { key: 0, repeatCount: 0, loopMode: BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE, workValue: BABYLON.Matrix.Zero() };
result = BABYLON.Utilities.InterpolateAnimation<BABYLON.Quaternion>(animation, time, (<any>animation)._state);
}
return result;
}
/** Set the passed matrix "result" as the sampled key frame value for the specfied animation track. */
public static SampleAnimationMatrix(animation:BABYLON.Animation, time: number):BABYLON.Matrix {
let result:BABYLON.Matrix = null;
if (animation != null && animation.dataType === BABYLON.Animation.ANIMATIONTYPE_MATRIX) {
const keys:BABYLON.IAnimationKey[] = animation.getKeys();
if (time < keys[0].frame) {
time = keys[0].frame;
} else if (time > keys[keys.length - 1].frame) {
time = keys[keys.length - 1].frame;
}
if ((<any>animation)._state == null) (<any>animation)._state = { key: 0, repeatCount: 0, loopMode: BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE, workValue: BABYLON.Matrix.Zero() };
result = BABYLON.Utilities.InterpolateAnimation<BABYLON.Matrix>(animation, time, (<any>animation)._state);
}
return result;
}
/** Creates a targeted float animation for tweening. */
public static CreateTweenAnimation(name:string, targetProperty:string, startValue:number, endValue:number, frameRate:number = 30, loopMode:number = BABYLON.Animation.ANIMATIONLOOPMODE_CONSTANT):BABYLON.Animation {
const keyFrames:any[] = [];
keyFrames.push({
frame: 0,
value: startValue,
});
keyFrames.push({
frame: frameRate,
value: endValue,
});
const result = new BABYLON.Animation(name, targetProperty, frameRate, BABYLON.Animation.ANIMATIONTYPE_FLOAT, loopMode);
result.setKeys(keyFrames);
return result;
}
/** Gets the last key frame index value. */
public static GetLastKeyFrameIndex(animation:BABYLON.Animation):number {
let result:number = 0;
if (animation != null) {
const keys:BABYLON.IAnimationKey[] = animation.getKeys();
if (keys != null && keys.length > 0) {
const lastKey:BABYLON.IAnimationKey = keys[keys.length - 1];
if (lastKey != null) {
result = lastKey.frame;
}
}
}
return result;
}
/** Private internal frame interpolation helper */
private static InterpolateAnimation<T>(animation:BABYLON.Animation, frame: number, state: BABYLON._IAnimationState): T {
return animation._interpolate(frame, state) as T;
}
https://playground.babylonjs.com/#7V0Y1I#240
Something like this, but that takes the tangents and all the good sauce into consideration.
Yes sir!
Yo @Deltakosh … can you please let us know when you made that PR for animation.getValueAtTime function
just track this one: Animation.Evaluate (Likeness to Unity.AnimationCurve.Evaluate) · Issue #9920 · BabylonJS/Babylon.js (github.com)
Good news people!
It is in!
This code can be run with the upcoming nightly:
const xSlide = new BABYLON.Animation("xSlide", "position.x", frameRate, BABYLON.Animation.ANIMATIONTYPE_FLOAT, BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE);
const keyFrames = [];
keyFrames.push({
frame: 0,
value: 2
});
keyFrames.push({
frame: frameRate,
value: -2
});
keyFrames.push({
frame: 2 * frameRate,
value: 2
});
xSlide.setKeys(keyFrames);
console.log(xSlide)
let t = 0
scene.onBeforeRenderObservable.add(()=>{
t += engine.getDeltaTime() *0.001
let d = Math.sin(t)*frameRate
box.position.x = xSlide.evaluate(d);
})
More specifically this: xSlide.evaluate(d);
Enjoy!
You are a gentleman and a scholar! Thank you sir, lots of uses for this.
Yo @Pryme8 … Its is basically what i was doing above (Example: SampleAnimationFloat function Above)… Only my version test frame time is with the key frame limits… But still just uses animation._interpolation just like i am doing above already
Expect you could not pass a 0-1 value to your method and get the whole animation I thought? Like wasn’t the problem that yours was frame specific? We tried it and it did not work which is why we posted this on the forum?
Ohh @Deltakosh looking at this it’s not what we really where looking for. The method is still taking frames not a normalized 0-1 value. Like I’d I pass the method a 2.1 it should see that as 0.1 but the second loop of the animation.
This is kinda just the same thing that we had already just a new access point it seems.
No… it works. The problem was missing tangents on the actual export of the curve.
Ask @bruuuuuno
Besides if you look at my interpolation function above, I am literally calling animation._interpolate
Just like the new animation.evaluate
Why are you awake!?!?
Still using frames, you are missing the point of what it’s supposed to do. Not frames a normalized 0-1 value for the entire animation.
Like if I pass it 6272.523 the evaluation method should only worry about the .523 and go to that % of the animation.
I guess just multiply the fractional value by the frame rate and just use your stuff?
For normalized 0 to 1 values of course you can just demoralize using the last key frame value
That’s what I do for the whole mechanim type animation system
It is driven by a base normalee time from 0 to 1 and all the blended anim tracks denormalize this value with the animation to value
See I was just asking for a method that handled that, so you did not have to do things like * frameRate.
Because I agree this is exactly what you were doing already.
If it was as simple as interpolate but scale your normalized value by frameRate then we did not really need anything 
Maybe @Deltakosh can make the evaluate function use normalized 0 to 1 values so we don’t have to manually calculate using framerate
Then everyone is happy 
Im happy for sure now that I know we had it the whole time cause of the Mac man! If I just gotta times it by the frameRate then that’s that, sounds good to me!